Fix sys/procfs.h pr_uid, pr_gid type (bug 23649)

[Florian Weimer]

On 09/13/2018 10:49 PM, Joseph Myers wrote:
> 2018-09-13  Joseph Myers<joseph@codesourcery.com>
> 
> 	[BZ #23649]
> 	* sysdeps/unix/sysv/linux/microblaze/sys/procfs.h (struct
> 	elf_prpsinfo): Use unsigned int for pr_uid and pr_gid.
> 	* sysdeps/unix/sysv/linux/mips/sys/procfs.h (struct elf_prpsinfo):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/nios2/sys/procfs.h (struct
> 	elf_prpsinfo): Likewise.
> 	* sysdeps/unix/sysv/linux/riscv/sys/procfs.h (struct
> 	elf_prpsinfo): Likewise.
> 	* sysdeps/unix/sysv/linux/sys/procfs.h (struct elf_prpsinfo):
> 	Likewise.

The changes look okay to me.  Does this need a NEWS entry?  After all, 
the struct size changes with this patch, as far as I can tell.

Thanks,
Florian